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ladybird/Meta/Lagom/Tools/CodeGenerators/LibWeb/GenerateWindowOrWorkerInterfaces.cpp
kleines Filmröllchen eada4f2ee8 AK: Remove ByteString from GenericLexer 
A bunch of users used consume_specific with a constant ByteString
literal, which can be replaced by an allocation-free StringView literal.

The generic consume_while overload gains a requires clause so that
consume_specific("abc") causes a more understandable and actionable
error.
2024-01-12 17:03:53 -07:00

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/*
* Copyright (c) 2022, Andrew Kaster <akaster@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/ByteString.h>
#include <AK/LexicalPath.h>
#include <AK/SourceGenerator.h>
#include <AK/StringBuilder.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibIDL/IDLParser.h>
#include <LibIDL/Types.h>
#include <LibMain/Main.h>
static ErrorOr<void> add_to_interface_sets(IDL::Interface&, Vector<IDL::Interface&>& intrinsics, Vector<IDL::Interface&>& window_exposed, Vector<IDL::Interface&>& dedicated_worker_exposed, Vector<IDL::Interface&>& shared_worker_exposed);
static ByteString s_error_string;
struct LegacyConstructor {
ByteString name;
ByteString constructor_class;
};
static void consume_whitespace(GenericLexer& lexer)
{
bool consumed = true;
while (consumed) {
consumed = lexer.consume_while(is_ascii_space).length() > 0;
if (lexer.consume_specific("//"sv)) {
lexer.consume_until('\n');
lexer.ignore();
consumed = true;
}
}
}
static Optional<LegacyConstructor> const& lookup_legacy_constructor(IDL::Interface& interface)
{
static HashMap<StringView, Optional<LegacyConstructor>> s_legacy_constructors;
if (auto cache = s_legacy_constructors.get(interface.name); cache.has_value())
return cache.value();
auto attribute = interface.extended_attributes.get("LegacyFactoryFunction"sv);
if (!attribute.has_value()) {
s_legacy_constructors.set(interface.name, {});
return s_legacy_constructors.get(interface.name).value();
}
GenericLexer function_lexer(attribute.value());
consume_whitespace(function_lexer);
auto name = function_lexer.consume_until([](auto ch) { return is_ascii_space(ch) || ch == '('; });
auto constructor_class = ByteString::formatted("{}Constructor", name);
s_legacy_constructors.set(interface.name, LegacyConstructor { name, move(constructor_class) });
return s_legacy_constructors.get(interface.name).value();
}
static ErrorOr<void> generate_forwarding_header(StringView output_path, Vector<IDL::Interface&>& exposed_interfaces)
{
StringBuilder builder;
SourceGenerator generator(builder);
generator.append(R"~~~(
#pragma once
namespace Web::Bindings {
)~~~");
auto add_namespace = [](SourceGenerator& gen, StringView namespace_class) {
gen.set("namespace_class", namespace_class);
gen.append(R"~~~(
class @namespace_class@;)~~~");
};
auto add_interface = [](SourceGenerator& gen, StringView prototype_class, StringView constructor_class, Optional<LegacyConstructor> const& legacy_constructor, StringView named_properties_class) {
gen.set("prototype_class", prototype_class);
gen.set("constructor_class", constructor_class);
gen.append(R"~~~(
class @prototype_class@;
class @constructor_class@;)~~~");
if (legacy_constructor.has_value()) {
gen.set("legacy_constructor_class", legacy_constructor->constructor_class);
gen.append(R"~~~(
class @legacy_constructor_class@;)~~~");
}
if (!named_properties_class.is_empty()) {
gen.set("named_properties_class", named_properties_class);
gen.append(R"~~~(
class @named_properties_class@;)~~~");
}
};
for (auto& interface : exposed_interfaces) {
auto gen = generator.fork();
String named_properties_class;
if (interface.extended_attributes.contains("Global") && interface.supports_named_properties()) {
named_properties_class = MUST(String::formatted("{}Properties", interface.name));
}
if (interface.is_namespace)
add_namespace(gen, interface.namespace_class);
else
add_interface(gen, interface.prototype_class, interface.constructor_class, lookup_legacy_constructor(interface), named_properties_class);
}
generator.append(R"~~~(
}
)~~~");
auto generated_forward_path = LexicalPath(output_path).append("Forward.h"sv).string();
auto generated_forward_file = TRY(Core::File::open(generated_forward_path, Core::File::OpenMode::Write));
TRY(generated_forward_file->write_until_depleted(generator.as_string_view().bytes()));
return {};
}
static ErrorOr<void> generate_intrinsic_definitions(StringView output_path, Vector<IDL::Interface&>& exposed_interfaces)
{
StringBuilder builder;
SourceGenerator generator(builder);
generator.append(R"~~~(
#include <LibJS/Heap/DeferGC.h>
#include <LibJS/Runtime/Object.h>
#include <LibWeb/Bindings/Intrinsics.h>)~~~");
for (auto& interface : exposed_interfaces) {
auto gen = generator.fork();
gen.set("namespace_class", interface.namespace_class);
gen.set("prototype_class", interface.prototype_class);
gen.set("constructor_class", interface.constructor_class);
if (interface.is_namespace) {
gen.append(R"~~~(
#include <LibWeb/Bindings/@namespace_class@.h>)~~~");
} else {
gen.append(R"~~~(
#include <LibWeb/Bindings/@constructor_class@.h>
#include <LibWeb/Bindings/@prototype_class@.h>)~~~");
if (auto const& legacy_constructor = lookup_legacy_constructor(interface); legacy_constructor.has_value()) {
gen.set("legacy_constructor_class", legacy_constructor->constructor_class);
gen.append(R"~~~(
#include <LibWeb/Bindings/@legacy_constructor_class@.h>)~~~");
}
}
}
generator.append(R"~~~(
namespace Web::Bindings {
)~~~");
auto add_namespace = [&](SourceGenerator& gen, StringView name, StringView namespace_class) {
gen.set("interface_name", name);
gen.set("namespace_class", namespace_class);
gen.append(R"~~~(
template<>
void Intrinsics::create_web_namespace<@namespace_class@>(JS::Realm& realm)
{
auto namespace_object = heap().allocate<@namespace_class@>(realm, realm);
m_namespaces.set("@interface_name@"_fly_string, namespace_object);
[[maybe_unused]] static constexpr u8 attr = JS::Attribute::Writable | JS::Attribute::Configurable;)~~~");
for (auto& interface : exposed_interfaces) {
if (interface.extended_attributes.get("LegacyNamespace"sv) != name)
continue;
gen.set("owned_interface_name", interface.name);
gen.set("owned_prototype_class", interface.prototype_class);
gen.append(R"~~~(
namespace_object->define_intrinsic_accessor("@owned_interface_name@", attr, [](auto& realm) -> JS::Value { return &Bindings::ensure_web_constructor<@owned_prototype_class@>(realm, "@interface_name@.@owned_interface_name@"_fly_string); });)~~~");
}
gen.append(R"~~~(
}
)~~~");
};
auto add_interface = [](SourceGenerator& gen, StringView name, StringView prototype_class, StringView constructor_class, Optional<LegacyConstructor> const& legacy_constructor, StringView named_properties_class) {
gen.set("interface_name", name);
gen.set("prototype_class", prototype_class);
gen.set("constructor_class", constructor_class);
gen.append(R"~~~(
template<>
void Intrinsics::create_web_prototype_and_constructor<@prototype_class@>(JS::Realm& realm)
{
auto& vm = realm.vm();
)~~~");
if (!named_properties_class.is_empty()) {
gen.set("named_properties_class", named_properties_class);
gen.append(R"~~~(
auto named_properties_object = heap().allocate<@named_properties_class@>(realm, realm);
m_prototypes.set("@named_properties_class@"_fly_string, named_properties_object);
)~~~");
}
gen.append(R"~~~(
auto prototype = heap().allocate<@prototype_class@>(realm, realm);
m_prototypes.set("@interface_name@"_fly_string, prototype);
auto constructor = heap().allocate<@constructor_class@>(realm, realm);
m_constructors.set("@interface_name@"_fly_string, constructor);
prototype->define_direct_property(vm.names.constructor, constructor.ptr(), JS::Attribute::Writable | JS::Attribute::Configurable);
constructor->define_direct_property(vm.names.name, JS::PrimitiveString::create(vm, "@interface_name@"_string), JS::Attribute::Configurable);
)~~~");
if (legacy_constructor.has_value()) {
gen.set("legacy_interface_name", legacy_constructor->name);
gen.set("legacy_constructor_class", legacy_constructor->constructor_class);
gen.append(R"~~~(
auto legacy_constructor = heap().allocate<@legacy_constructor_class@>(realm, realm);
m_constructors.set("@legacy_interface_name@"_fly_string, legacy_constructor);
legacy_constructor->define_direct_property(vm.names.name, JS::PrimitiveString::create(vm, "@legacy_interface_name@"_string), JS::Attribute::Configurable);)~~~");
}
gen.append(R"~~~(
}
)~~~");
};
for (auto& interface : exposed_interfaces) {
auto gen = generator.fork();
String named_properties_class;
if (interface.extended_attributes.contains("Global") && interface.supports_named_properties()) {
named_properties_class = MUST(String::formatted("{}Properties", interface.name));
}
if (interface.is_namespace)
add_namespace(gen, interface.name, interface.namespace_class);
else
add_interface(gen, interface.namespaced_name, interface.prototype_class, interface.constructor_class, lookup_legacy_constructor(interface), named_properties_class);
}
generator.append(R"~~~(
}
)~~~");
auto generated_intrinsics_path = LexicalPath(output_path).append("IntrinsicDefinitions.cpp"sv).string();
auto generated_intrinsics_file = TRY(Core::File::open(generated_intrinsics_path, Core::File::OpenMode::Write));
TRY(generated_intrinsics_file->write_until_depleted(generator.as_string_view().bytes()));
return {};
}
static ErrorOr<void> generate_exposed_interface_header(StringView class_name, StringView output_path)
{
StringBuilder builder;
SourceGenerator generator(builder);
generator.set("global_object_snake_name", ByteString(class_name).to_snakecase());
generator.append(R"~~~(
#pragma once
#include <LibJS/Forward.h>
namespace Web::Bindings {
void add_@global_object_snake_name@_exposed_interfaces(JS::Object&);
}
)~~~");
auto generated_header_path = LexicalPath(output_path).append(ByteString::formatted("{}ExposedInterfaces.h", class_name)).string();
auto generated_header_file = TRY(Core::File::open(generated_header_path, Core::File::OpenMode::Write));
TRY(generated_header_file->write_until_depleted(generator.as_string_view().bytes()));
return {};
}
static ErrorOr<void> generate_exposed_interface_implementation(StringView class_name, StringView output_path, Vector<IDL::Interface&>& exposed_interfaces)
{
StringBuilder builder;
SourceGenerator generator(builder);
generator.set("global_object_name", class_name);
generator.set("global_object_snake_name", ByteString(class_name).to_snakecase());
generator.append(R"~~~(
#include <LibJS/Runtime/Object.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Bindings/@global_object_name@ExposedInterfaces.h>
)~~~");
for (auto& interface : exposed_interfaces) {
auto gen = generator.fork();
gen.set("namespace_class", interface.namespace_class);
gen.set("prototype_class", interface.prototype_class);
gen.set("constructor_class", interface.constructor_class);
if (interface.is_namespace) {
gen.append(R"~~~(#include <LibWeb/Bindings/@namespace_class@.h>
)~~~");
} else {
gen.append(R"~~~(#include <LibWeb/Bindings/@constructor_class@.h>
#include <LibWeb/Bindings/@prototype_class@.h>
)~~~");
if (auto const& legacy_constructor = lookup_legacy_constructor(interface); legacy_constructor.has_value()) {
gen.set("legacy_constructor_class", legacy_constructor->constructor_class);
gen.append(R"~~~(#include <LibWeb/Bindings/@legacy_constructor_class@.h>
)~~~");
}
}
}
generator.append(R"~~~(
namespace Web::Bindings {
void add_@global_object_snake_name@_exposed_interfaces(JS::Object& global)
{
static constexpr u8 attr = JS::Attribute::Writable | JS::Attribute::Configurable;
)~~~");
auto add_interface = [](SourceGenerator& gen, StringView name, StringView prototype_class, Optional<LegacyConstructor> const& legacy_constructor, Optional<ByteString> const& legacy_alias_name) {
gen.set("interface_name", name);
gen.set("prototype_class", prototype_class);
gen.append(R"~~~(
global.define_intrinsic_accessor("@interface_name@", attr, [](auto& realm) -> JS::Value { return &ensure_web_constructor<@prototype_class@>(realm, "@interface_name@"_fly_string); });)~~~");
// https://webidl.spec.whatwg.org/#LegacyWindowAlias
if (legacy_alias_name.has_value()) {
if (legacy_alias_name->starts_with('(')) {
auto legacy_alias_names = legacy_alias_name->substring_view(1).split_view(',');
for (auto legacy_alias_name : legacy_alias_names) {
gen.set("interface_alias_name", legacy_alias_name.trim_whitespace());
gen.append(R"~~~(
global.define_intrinsic_accessor("@interface_alias_name@", attr, [](auto& realm) -> JS::Value { return &ensure_web_constructor<@prototype_class@>(realm, "@interface_name@"_fly_string); });)~~~");
}
} else {
gen.set("interface_alias_name", *legacy_alias_name);
gen.append(R"~~~(
global.define_intrinsic_accessor("@interface_alias_name@", attr, [](auto& realm) -> JS::Value { return &ensure_web_constructor<@prototype_class@>(realm, "@interface_name@"_fly_string); });)~~~");
}
}
if (legacy_constructor.has_value()) {
gen.set("legacy_interface_name", legacy_constructor->name);
gen.append(R"~~~(
global.define_intrinsic_accessor("@legacy_interface_name@", attr, [](auto& realm) -> JS::Value { return &ensure_web_constructor<@prototype_class@>(realm, "@legacy_interface_name@"_fly_string); });)~~~");
}
};
auto add_namespace = [](SourceGenerator& gen, StringView name, StringView namespace_class) {
gen.set("interface_name", name);
gen.set("namespace_class", namespace_class);
gen.append(R"~~~(
global.define_intrinsic_accessor("@interface_name@", attr, [](auto& realm) -> JS::Value { return &ensure_web_namespace<@namespace_class@>(realm, "@interface_name@"_fly_string); });)~~~");
};
for (auto& interface : exposed_interfaces) {
auto gen = generator.fork();
if (interface.is_namespace) {
add_namespace(gen, interface.name, interface.namespace_class);
} else if (!interface.extended_attributes.contains("LegacyNamespace"sv)) {
if (class_name == "Window") {
add_interface(gen, interface.namespaced_name, interface.prototype_class, lookup_legacy_constructor(interface), interface.extended_attributes.get("LegacyWindowAlias"sv));
} else {
add_interface(gen, interface.namespaced_name, interface.prototype_class, lookup_legacy_constructor(interface), {});
}
}
}
generator.append(R"~~~(
}
}
)~~~");
auto generated_implementation_path = LexicalPath(output_path).append(ByteString::formatted("{}ExposedInterfaces.cpp", class_name)).string();
auto generated_implementation_file = TRY(Core::File::open(generated_implementation_path, Core::File::OpenMode::Write));
TRY(generated_implementation_file->write_until_depleted(generator.as_string_view().bytes()));
return {};
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
Core::ArgsParser args_parser;
StringView output_path;
StringView base_path;
Vector<ByteString> paths;
args_parser.add_option(output_path, "Path to output generated files into", "output-path", 'o', "output-path");
args_parser.add_option(base_path, "Path to root of IDL file tree", "base-path", 'b', "base-path");
args_parser.add_positional_argument(paths, "Paths of every IDL file that could be Exposed", "paths");
args_parser.parse(arguments);
VERIFY(!paths.is_empty());
VERIFY(!base_path.is_empty());
LexicalPath const lexical_base(base_path);
// Read in all IDL files, we must own the storage for all of these for the lifetime of the program
Vector<ByteString> file_contents;
for (ByteString const& path : paths) {
auto file_or_error = Core::File::open(path, Core::File::OpenMode::Read);
if (file_or_error.is_error()) {
s_error_string = ByteString::formatted("Unable to open file {}", path);
return Error::from_string_view(s_error_string.view());
}
auto file = file_or_error.release_value();
auto string = MUST(file->read_until_eof());
file_contents.append(ByteString(ReadonlyBytes(string)));
}
VERIFY(paths.size() == file_contents.size());
Vector<IDL::Parser> parsers;
Vector<IDL::Interface&> intrinsics;
Vector<IDL::Interface&> window_exposed;
Vector<IDL::Interface&> dedicated_worker_exposed;
Vector<IDL::Interface&> shared_worker_exposed;
// TODO: service_worker_exposed
for (size_t i = 0; i < paths.size(); ++i) {
IDL::Parser parser(paths[i], file_contents[i], lexical_base.string());
TRY(add_to_interface_sets(parser.parse(), intrinsics, window_exposed, dedicated_worker_exposed, shared_worker_exposed));
parsers.append(move(parser));
}
TRY(generate_forwarding_header(output_path, intrinsics));
TRY(generate_intrinsic_definitions(output_path, intrinsics));
TRY(generate_exposed_interface_header("Window"sv, output_path));
TRY(generate_exposed_interface_header("DedicatedWorker"sv, output_path));
TRY(generate_exposed_interface_header("SharedWorker"sv, output_path));
// TODO: ServiceWorkerExposed.h
TRY(generate_exposed_interface_implementation("Window"sv, output_path, window_exposed));
TRY(generate_exposed_interface_implementation("DedicatedWorker"sv, output_path, dedicated_worker_exposed));
TRY(generate_exposed_interface_implementation("SharedWorker"sv, output_path, shared_worker_exposed));
// TODO: ServiceWorkerExposed.cpp
return 0;
}
enum ExposedTo {
Nobody = 0x0,
DedicatedWorker = 0x1,
SharedWorker = 0x2,
ServiceWorker = 0x4,
AudioWorklet = 0x8,
Window = 0x10,
AllWorkers = 0xF, // FIXME: Is "AudioWorklet" a Worker? We'll assume it is for now
All = 0x1F,
};
AK_ENUM_BITWISE_OPERATORS(ExposedTo);
static ErrorOr<ExposedTo> parse_exposure_set(IDL::Interface& interface)
{
// NOTE: This roughly follows the definitions of https://webidl.spec.whatwg.org/#Exposed
// It does not remotely interpret all the abstract operations therein though.
auto maybe_exposed = interface.extended_attributes.get("Exposed");
if (!maybe_exposed.has_value()) {
s_error_string = ByteString::formatted("Interface {} is missing extended attribute Exposed", interface.name);
return Error::from_string_view(s_error_string.view());
}
auto exposed = maybe_exposed.value().trim_whitespace();
if (exposed == "*"sv)
return ExposedTo::All;
if (exposed == "Nobody"sv)
return ExposedTo::Nobody;
if (exposed == "Window"sv)
return ExposedTo::Window;
if (exposed == "Worker"sv)
return ExposedTo::AllWorkers;
if (exposed == "AudioWorklet"sv)
return ExposedTo::AudioWorklet;
if (exposed[0] == '(') {
ExposedTo whom = Nobody;
for (StringView candidate : exposed.substring_view(1, exposed.length() - 1).split_view(',')) {
candidate = candidate.trim_whitespace();
if (candidate == "Window"sv) {
whom |= ExposedTo::Window;
} else if (candidate == "Worker"sv) {
whom |= ExposedTo::AllWorkers;
} else if (candidate == "DedicatedWorker"sv) {
whom |= ExposedTo::DedicatedWorker;
} else if (candidate == "SharedWorker"sv) {
whom |= ExposedTo::SharedWorker;
} else if (candidate == "ServiceWorker"sv) {
whom |= ExposedTo::ServiceWorker;
} else if (candidate == "AudioWorklet"sv) {
whom |= ExposedTo::AudioWorklet;
} else {
s_error_string = ByteString::formatted("Unknown Exposed attribute candidate {} in {} in {}", candidate, exposed, interface.name);
return Error::from_string_view(s_error_string.view());
}
}
if (whom == ExposedTo::Nobody) {
s_error_string = ByteString::formatted("Unknown Exposed attribute {} in {}", exposed, interface.name);
return Error::from_string_view(s_error_string.view());
}
return whom;
}
s_error_string = ByteString::formatted("Unknown Exposed attribute {} in {}", exposed, interface.name);
return Error::from_string_view(s_error_string.view());
}
ErrorOr<void> add_to_interface_sets(IDL::Interface& interface, Vector<IDL::Interface&>& intrinsics, Vector<IDL::Interface&>& window_exposed, Vector<IDL::Interface&>& dedicated_worker_exposed, Vector<IDL::Interface&>& shared_worker_exposed)
{
// TODO: Add service worker exposed and audio worklet exposed
auto whom = TRY(parse_exposure_set(interface));
intrinsics.append(interface);
if (whom & ExposedTo::Window)
window_exposed.append(interface);
if (whom & ExposedTo::DedicatedWorker)
dedicated_worker_exposed.append(interface);
if (whom & ExposedTo::SharedWorker)
shared_worker_exposed.append(interface);
return {};
}
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